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Submission #728967

# Submission time Handle Problem Language Result Execution time Memory
728967 2023-04-23T10:26:59 Z LucasLe Event Hopping (BOI22_events) C++17
100 / 100
 471 ms 25844 KB 
#include <bits/stdc++.h>
#define st first
#define nd second
using namespace std;
const int LG = 17;

int main() {
  int n, q; cin >> n >> q;
  
  vector<vector<int>> nx(LG);
  vector<vector<pair<int, int>>> rmq(LG);
  for (int i = 0; i < LG; i++)
    nx[i].resize(n), rmq[i].resize(n, {1'000'000'001, -1});
  
  vector<pair<int, int>> a(n);
  vector<int> b;
  
  for (int i = 0; i < n; i++) {
    cin >> a[i].st >> a[i].nd;
    b.push_back(a[i].nd);
  }
  
  sort(b.begin(), b.end());
  b.erase(unique(b.begin(), b.end()), b.end());
  
  for (int i = 0; i < n; i++) {
    int r = lower_bound(b.begin(), b.end(), a[i].nd) - b.begin();
    rmq[0][r] = min(rmq[0][r], {a[i].st, i});
  }

  
  for (int i = 0; i + 1 < LG; i++)
    for (int j = 0; j + (1 << (i + 1)) <= n; j++)
      rmq[i + 1][j] = min(rmq[i][j], rmq[i][j + (1 << i)]);

  for (int i = 0; i < n; i++) {
    int l = lower_bound(b.begin(), b.end(), a[i].st) - b.begin();
    int r = lower_bound(b.begin(), b.end(), a[i].nd) - b.begin();
    int h = log2(r - l + 1);
    nx[0][i] = min(rmq[h][l], rmq[h][r - (1 << h) + 1]).nd;
  }
  
  for (int i = 0; i + 1 < LG; i++)
    for (int j = 0; j < n; j++)
      nx[i + 1][j] = nx[i][nx[i][j]];

  while (q--) {
    int x, y, l = 1; cin >> x >> y; x--, y--;
    if (x == y || (a[y].st <= a[x].nd && a[x].nd <= a[y].nd)) {
      cout << (x == y ? 0 : 1) << "\n";
      continue;
    }
    for (int i = LG - 1; ~i; --i) {
      if (a[x].nd < a[nx[i][y]].st)
        l += 1 << i, y = nx[i][y];
    }
    y = nx[0][y];
    if (a[x].nd < a[y].st || a[x].nd > a[y].nd)
      cout << "impossible\n";
    else
      cout << l + 1 << "\n";
  }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 471 ms 25256 KB Output is correct
3 Correct 390 ms 25284 KB Output is correct
4 Correct 455 ms 25248 KB Output is correct
5 Correct 441 ms 25292 KB Output is correct
6 Correct 388 ms 25388 KB Output is correct
7 Correct 391 ms 25432 KB Output is correct
8 Correct 454 ms 25764 KB Output is correct
9 Correct 407 ms 25752 KB Output is correct
10 Correct 424 ms 25760 KB Output is correct
11 Correct 399 ms 25740 KB Output is correct
12 Correct 298 ms 25184 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 296 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 3 ms 444 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 3 ms 532 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 296 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 3 ms 444 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 3 ms 532 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 2 ms 468 KB Output is correct
13 Correct 2 ms 440 KB Output is correct
14 Correct 2 ms 468 KB Output is correct
15 Correct 2 ms 468 KB Output is correct
16 Correct 2 ms 540 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 180 ms 2800 KB Output is correct
20 Correct 195 ms 2884 KB Output is correct
21 Correct 187 ms 3072 KB Output is correct
22 Correct 187 ms 3244 KB Output is correct
23 Correct 176 ms 3036 KB Output is correct
24 Correct 199 ms 3040 KB Output is correct
25 Correct 183 ms 2612 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 296 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 3 ms 444 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 3 ms 532 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 280 KB Output is correct
12 Correct 2 ms 440 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 2 ms 468 KB Output is correct
15 Correct 3 ms 440 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 2 ms 468 KB Output is correct
19 Correct 142 ms 23584 KB Output is correct
20 Correct 107 ms 22776 KB Output is correct
21 Correct 155 ms 23536 KB Output is correct
22 Correct 132 ms 23460 KB Output is correct
23 Correct 126 ms 23564 KB Output is correct
24 Correct 172 ms 23552 KB Output is correct
25 Correct 72 ms 22856 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 321 ms 25280 KB Output is correct
2 Correct 345 ms 25308 KB Output is correct
3 Correct 462 ms 25312 KB Output is correct
4 Correct 380 ms 25716 KB Output is correct
5 Correct 387 ms 25640 KB Output is correct
6 Correct 361 ms 25412 KB Output is correct
7 Correct 420 ms 25420 KB Output is correct
8 Correct 368 ms 25572 KB Output is correct
9 Correct 143 ms 23560 KB Output is correct
10 Correct 364 ms 25076 KB Output is correct
11 Correct 374 ms 24852 KB Output is correct
12 Correct 374 ms 25100 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 471 ms 25256 KB Output is correct
3 Correct 390 ms 25284 KB Output is correct
4 Correct 455 ms 25248 KB Output is correct
5 Correct 441 ms 25292 KB Output is correct
6 Correct 388 ms 25388 KB Output is correct
7 Correct 391 ms 25432 KB Output is correct
8 Correct 454 ms 25764 KB Output is correct
9 Correct 407 ms 25752 KB Output is correct
10 Correct 424 ms 25760 KB Output is correct
11 Correct 399 ms 25740 KB Output is correct
12 Correct 298 ms 25184 KB Output is correct
13 Correct 1 ms 296 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 3 ms 444 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 3 ms 532 KB Output is correct
19 Correct 2 ms 468 KB Output is correct
20 Correct 2 ms 468 KB Output is correct
21 Correct 1 ms 468 KB Output is correct
22 Correct 0 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 2 ms 468 KB Output is correct
25 Correct 2 ms 440 KB Output is correct
26 Correct 2 ms 468 KB Output is correct
27 Correct 2 ms 468 KB Output is correct
28 Correct 2 ms 540 KB Output is correct
29 Correct 2 ms 468 KB Output is correct
30 Correct 1 ms 468 KB Output is correct
31 Correct 180 ms 2800 KB Output is correct
32 Correct 195 ms 2884 KB Output is correct
33 Correct 187 ms 3072 KB Output is correct
34 Correct 187 ms 3244 KB Output is correct
35 Correct 176 ms 3036 KB Output is correct
36 Correct 199 ms 3040 KB Output is correct
37 Correct 183 ms 2612 KB Output is correct
38 Correct 1 ms 212 KB Output is correct
39 Correct 1 ms 280 KB Output is correct
40 Correct 2 ms 440 KB Output is correct
41 Correct 2 ms 468 KB Output is correct
42 Correct 2 ms 468 KB Output is correct
43 Correct 3 ms 440 KB Output is correct
44 Correct 2 ms 468 KB Output is correct
45 Correct 2 ms 468 KB Output is correct
46 Correct 2 ms 468 KB Output is correct
47 Correct 142 ms 23584 KB Output is correct
48 Correct 107 ms 22776 KB Output is correct
49 Correct 155 ms 23536 KB Output is correct
50 Correct 132 ms 23460 KB Output is correct
51 Correct 126 ms 23564 KB Output is correct
52 Correct 172 ms 23552 KB Output is correct
53 Correct 72 ms 22856 KB Output is correct
54 Correct 321 ms 25280 KB Output is correct
55 Correct 345 ms 25308 KB Output is correct
56 Correct 462 ms 25312 KB Output is correct
57 Correct 380 ms 25716 KB Output is correct
58 Correct 387 ms 25640 KB Output is correct
59 Correct 361 ms 25412 KB Output is correct
60 Correct 420 ms 25420 KB Output is correct
61 Correct 368 ms 25572 KB Output is correct
62 Correct 143 ms 23560 KB Output is correct
63 Correct 364 ms 25076 KB Output is correct
64 Correct 374 ms 24852 KB Output is correct
65 Correct 374 ms 25100 KB Output is correct
66 Correct 2 ms 212 KB Output is correct
67 Correct 358 ms 25328 KB Output is correct
68 Correct 441 ms 25336 KB Output is correct
69 Correct 415 ms 25216 KB Output is correct
70 Correct 387 ms 25344 KB Output is correct
71 Correct 341 ms 25392 KB Output is correct
72 Correct 395 ms 25360 KB Output is correct
73 Correct 366 ms 25844 KB Output is correct
74 Correct 364 ms 25796 KB Output is correct
75 Correct 413 ms 25664 KB Output is correct
76 Correct 385 ms 25652 KB Output is correct
77 Correct 305 ms 24976 KB Output is correct
78 Correct 1 ms 212 KB Output is correct
79 Correct 3 ms 468 KB Output is correct
80 Correct 2 ms 536 KB Output is correct
81 Correct 2 ms 468 KB Output is correct
82 Correct 2 ms 440 KB Output is correct
83 Correct 2 ms 468 KB Output is correct
84 Correct 2 ms 440 KB Output is correct
85 Correct 2 ms 468 KB Output is correct
86 Correct 222 ms 2740 KB Output is correct
87 Correct 185 ms 2900 KB Output is correct
88 Correct 212 ms 3140 KB Output is correct
89 Correct 216 ms 3112 KB Output is correct
90 Correct 190 ms 2980 KB Output is correct
91 Correct 194 ms 2952 KB Output is correct
92 Correct 223 ms 2664 KB Output is correct
93 Correct 155 ms 23580 KB Output is correct
94 Correct 115 ms 22776 KB Output is correct
95 Correct 137 ms 23476 KB Output is correct
96 Correct 158 ms 23628 KB Output is correct
97 Correct 141 ms 23452 KB Output is correct
98 Correct 145 ms 23448 KB Output is correct
99 Correct 90 ms 22872 KB Output is correct
100 Correct 444 ms 25352 KB Output is correct
101 Correct 397 ms 25412 KB Output is correct
102 Correct 369 ms 25736 KB Output is correct
103 Correct 462 ms 25012 KB Output is correct
104 Correct 399 ms 24900 KB Output is correct
105 Correct 356 ms 25144 KB Output is correct
106 Correct 363 ms 24736 KB Output is correct
107 Correct 435 ms 24728 KB Output is correct
108 Correct 370 ms 25388 KB Output is correct
109 Correct 345 ms 25556 KB Output is correct
110 Correct 325 ms 25300 KB Output is correct
111 Correct 390 ms 25344 KB Output is correct